hey guys i think i ruined my print head but i dont know how.i had problems with my mp530 i wasnt getting any black out of my bk cart (the smaller of the two blacks) i did all the recomended procedures and finally got the ink to flow through when i had it setting on paper towel(i put the ink on just the smaller screen) But it still didnt print when i did a nozzel check or when i printed a photo???? so i thought i was clogged again soaked the head again now i get a error check cartridge UO52 I HAVE tryed resetting cartridges and clean contacts but nothing now i cant fax (yes i still fax quit a bit L.O.L or use the scanner) any other suggestions so i dont know if i should buy a print head because they are non refundable( i wouldnt mind it if my ip4200 used the same head then i would keep it for that but read that they are different heads)